Host *
  # verbosity used when logging messages from ssh, QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1, DEBUG2, DEBUG3
  LogLevel INFO
  # if YES, never auto add host keyes and refuses to connecto to hosts that have changed. YES, NO, ASK
  StrictHostKeyChecking ask  
  # known hosts file database location
  UserKnownHostsFile ~/.ssh/known_hosts
  # timeout in seconds after which if no data has been recieved from the server, ssh will send a keep alive message
  ServerAliveInterval 30 
  # the number of times to send a keep alive message in a row, only applies to ssh v2
  ServerAliveCountMax 120
  # Shows the ssh key image on connection. YES or NO
  VisualHostKey yes 
  # if the connection should use compression. YES or NO
  Compression yes 
  # allows ssh to prefer one method of auth over another if there are multiple methods available. gssapi-with-mic, hostbased, publickey, keyboard-interactive, password
  PreferredAuthentications publickey,password,keyboard-interactive
  # send TCP keep alive messages to the host, which lets us know if the connection dies, but it can give false negatives (if the connection goes down temporarily, you'll get disconnected). YES, NO
  TCPKeepAlive yes 

  # refer to: https://github.com/FiloSottile/whosthere/blob/master/README.md
  PubkeyAuthentication yes
  IdentitiesOnly yes